Before using this form, please try to report using the "Report problem with ads" link in the footer. It gathers a bunch of information that is useful to the ad network in identifying and blocking the ad. The ad report will be given directly to the ad network instead of being sent to El Jefe's email, which he is notoriously slow to check.
If the ad has an AdChoice link in the top right (often just a blue triangle and an X), please use the X to report the ad. That will report it directly to Google, and it will contain all of the information they need to block the ad. If the ad has the AdChoice triangle, but not the X, please report it using the AdWords Ad Feedback Form.